Is the lack of wanting to do any kind of physical training what so ever, much like lackagymitis. This disease makes people to lazy to get off their asses to do any kind of physical labor. It is also much like being a couch potatoe. Unfortunately this disease is most commonly found in military members who just stopped giving a fuck.

I lost all my results from basic after returning home due to lackaptitis.

Oh shit I have a pt test coming up at the end of the month, damn that lackaptitis I guess I am going to have to fail cause I am not going to get out of the AC to do any kind of running